package com.edu.util;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.logging.Level;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.edu.exception.FileException;

public class IOHelper {


    private final static Logger logger = LoggerFactory.getLogger(IOHelper.class);

    /**
     * 创建文件
     *
     * @param fileName
     * @return
     */
    public static boolean createFile(File fileName) throws Exception {
        try {
            if (!fileName.exists()) {
                fileName.createNewFile();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }

    /**
     * 读取TXT内容
     *
     * @param file
     * @return
     */
    public static String readTxtFile(File file) {
        String result = "";
        try {
            InputStreamReader reader = new InputStreamReader(new FileInputStream(file), "gbk");
            BufferedReader br = new BufferedReader(reader);
            String s = null;
            while ((s = br.readLine()) != null) {
                result = result + s;
                System.out.println(s);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 写入TXT，覆盖原内容
     *
     * @param content
     * @param fileName
     * @return
     * @throws Exception
     */
    public static boolean writeTxtFile(String content, File fileName) throws FileException {
        //RandomAccessFile mm = null;
        boolean flag = false;
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(fileName);
            fileOutputStream.write(content.getBytes("utf-8"));
            fileOutputStream.close();
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }

    /**
     * 写入TXT，追加写入
     *
     * @param filePath
     * @param content
     */
    public static void fileChaseFW(String filePath, String content) {
        try {
            // 构造函数中的第二个参数true表示以追加形式写文件
            FileWriter fw = new FileWriter(filePath, true);
            fw.write(content);
            fw.close();
        } catch (IOException e) {
            System.out.println("文件写入失败！" + e);
        }
    }

    public static byte[] fileToBytes(File file) {
        byte[] buffer = null;

        FileInputStream fis = null;
        ByteArrayOutputStream bos = null;

        try {
            fis = new FileInputStream(file);
            bos = new ByteArrayOutputStream();

            byte[] b = new byte[1024];

            int n;

            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }

            buffer = bos.toByteArray();
        } catch (FileNotFoundException ex) {
            logger.debug(ex.getMessage());
        } catch (IOException ex) {
            logger.debug(ex.getMessage());
        } finally {
            try {
                if (null != bos) {
                    bos.close();
                }
            } catch (IOException ex) {
                logger.debug(ex.getMessage());
            } finally {
                try {
                    if (null != fis) {
                        fis.close();
                    }
                } catch (IOException ex) {
                    logger.debug(ex.getMessage());
                }
            }
        }

        return buffer;
    }

    public static void bytesToFile(byte[] buffer, final File file) {


        OutputStream output = null;
        BufferedOutputStream bufferedOutput = null;

        try {
            output = new FileOutputStream(file);

            bufferedOutput = new BufferedOutputStream(output);

            bufferedOutput.write(buffer);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != bufferedOutput) {
                try {
                    bufferedOutput.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (null != output) {
                try {
                    output.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
